I.: Elgood, John H.: Birds of the West African Town and Garden. London, Longman 1976. OKart. ISBN 0582608503 / II.: Perlo, Ber van: Birds of Eastern Africa (= Collins illustrated Checklist). London, Harper Collins 1995. OKart. ISBN 0002199378 / III.: Someren, Vernon D. van: A Bird Watcher in Kenya. Edinburgh, Oliver & Boyd 1958. OLn. m. OU. / IV.: Gill, Leonard E.: A first Guide to South African Birds. Cape Town, Miller 1968. OLn., Text with annotations. Books with traces of storage.